From 13bcc785d3ca8ec0227779ee5001bcf97f0a8819 Mon Sep 17 00:00:00 2001
From: Mark Zhang <markthezhang@gmail.com>
Date: Tue, 2 Jun 2026 13:49:00 -0400
Subject: [PATCH] Remove riemann_solver check when running IGR

---
 toolchain/mfc/case_validator.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/toolchain/mfc/case_validator.py b/toolchain/mfc/case_validator.py
index 6fdfc408db..f90ef0efbc 100644
--- a/toolchain/mfc/case_validator.py
+++ b/toolchain/mfc/case_validator.py
@@ -668,6 +668,10 @@ def check_riemann_solver(self):
         low_Mach = self.get("low_Mach", 0)
         cyl_coord = self.get("cyl_coord", "F") == "T"
         viscous = self.get("viscous", "F") == "T"
+        igr = self.get("igr", "F") == "T"
+
+        if igr:
+            return
 
         self.prohibit(riemann_solver is None, "riemann_solver must be specified (1=HLL, 2=HLLC, 4=HLLD, 5=Lax-Friedrichs)")
         if riemann_solver is None: